If it were me, I'd zip over to Home deport or the closest paint store to you and purchase the large container of TSP ( Trisodium phospate ) TSP which is a crystal you may be familiar with to mix with warm water and wash / degrease walls with prior to painting.
What you want to accomplish is approximately a 15 to 1 ratio Water to TSP ( fill the cooler - wear rubber gloves and safety glasses and slosh it around / wipe all the interior surfaces ) Trisodium Phosphate is a strong alkaline so it will sting the skin.
I use TSP for cleaning copper pipe and fittings for high pressure oxygen use and believe me it cleans as good or better that all the expensive cleaners. rinse it out after with lots of tap water and I can't believe there would be enough chemical residue of anything left in there to smell. TSP by the way in mild portion is also used as a food additive so while you want to rinse it out, any residue will not be a threat should you store ice cubes etc that wind up in drinks.
Have a Cool 1 ......
Making stuff is making fun as long as you do it safe.
Last edited by gwizz; 07-03-2013 at 12:59 PM.